熱処理加工によるアミランの特性に関する研究-1-

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For the purpose of elucidating the fundamental fibrous behaviors of Amilan under various conditions of heating and cooling treatment and to establish a suitable heat treatment to give the required properties for specific end uses, the author subjected Amilan to sudden cooling in water, natural cooling in air, and slow cooling in furnace after dry heat treatments at hifferent temperatures under no tension.<BR>Experimental results will be summarized as follows : <BR>(1) The visco-elastic elongation of the creeping samples under loading after the heat treatment is increased with the rise of temperature and decreased gradually at a higher temperature. The recovery rate of elongation on the occasion of unloading is deoreased gradually with the rise of temperature.<BR>The effects of the cooling rate upon visco-elastic elongation under loading are greater as it grows larger, and those upon recovery rate of elongation on the occasion of unloading is reversed.<BR>(2) The shrinkage during heating is increased, with the rise of temperature and shows very marked increase at higher temperatures. The amount of shrinkage is the largest when water cooled, less when air cooled, and the least when furnace cooled. (3) The breaking strength becomes higher than that of untreated sample with the rise of treating temperature, but is decreased suddenly at a higher temperature while the breaking elongation is slowly increased. The more both strength and elongation are influenced, the slower the cooling rate. (4) Amilan shows a peculiarity at about 40°-60°C and 160°C. Hence the transition ranges lie in the neighbourhood of 40°-60°C and 160°C. (5) The X-ray photographs show that there have occured both crystallization and uncrystallization by heat treatment. The crystallite orientation alone can not fully explain the rate of hygroscopicity.
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熱処理加工によるアミランの特性に関する研究-1-

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